First try at removing ? from HTML.

tools/dom/scripts/htmldartgenerator.py

 #!/usr/bin/python
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 """This module provides shared functionality for the system to generate
 dart:html APIs from the IDL database."""
 
 import emitter
 from generator import AnalyzeOperation, ConstantOutputOrder, \
@@ skipping 372 matching lines @@
               '  }\n',
               CTOR=constructor_info._ConstructorFullName(self._DartType),
               PARAMS=constructor_info.ParametersDeclaration(self._DartType),
               FACTORY=factory_name,
               ANNOTATIONS=annotations,
               FACTORY_PARAMS=constructor_info.ParametersAsArgumentList())
 
           for index, param_info in enumerate(constructor_info.param_infos):
             if param_info.is_optional:
               dispatcher_emitter.Emit(
-                '    if (!?$OPT_PARAM_NAME) {\n'
+                '    if ($OPT_PARAM_NAME == null) {\n'
                 '      return $FACTORY._create($FACTORY_PARAMS);\n'
                 '    }\n',
                 OPT_PARAM_NAME=param_info.name,
                 FACTORY=factory_name,
                 FACTORY_PARAMS=constructor_info.ParametersAsArgumentList(index))
         else:
           inits = self._members_emitter.Emit(
               '\n  $(ANNOTATIONS)'
               'factory $CONSTRUCTOR($PARAMS) {\n'
               '    var e = $FACTORY.$CTOR_FACTORY_NAME($FACTORY_PARAMS);\n'
@@ skipping 190 matching lines @@
         walk(interface.parents)
       else:
         walk(interface.parents[1:])
     return result
 
   def _DartType(self, type_name):
     return self._type_registry.DartType(type_name)
 
   def _IsPrivate(self, name):
     return name.startswith('_')